Peel the potatoes and cube it. Deep fry all the cubes till done on all sides, keep it aside.
Heat cooking oil in a nonstick pan. Add black cardamom, cloves and black peppercorns in the oil and fry for a few seconds.
Add sliced onion, green chilies and fry till translucent.
Add the masala paste and cook for 2 - 3 minutes on high flame.
Add coriander powder, turmeric powder, Kashmiri red chili powder, garam masala powder, and salt and cook until the cooking oil starts to separate from sides.
Whisk the curds well and add it in the pan. Add a cup of water and fried potatoes.
Cover the lid of the pan and cook until the potato is done.
Garnish with fresh coriander.
Serve hot with Bengali Mishti Pulao or Roti.